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All brown crustaceous lichen, with black with few black dots per "field" - I've been think Verrucaria genus.
Seen growing on bare rocks, in a midst of other lichens, a multitude of them. Seen on slopes of one of the lower peaks of Caucasus, at some 2200 - 2300 m of altitude, and in an adjacent valley, laying at some 1900m. The valley and these slopes are regularly beaten by harsh winds, and are intermittently covered by coniferous groves, thorny shrub groves, mountain grasslands and barren rocks.
Actually, this one was not the aim of my click - I discovered it back home, when trying to identify other lichens around this one; which explains this out-of-focus pic...